The primary objective of this 2-year project is to further refine and conduct preliminary validation of a novel set of test-tasks known as the Assessment of Military Multitasking Performance (AMMP). The AMMP is a battery of functional dual- and multi tasks that simulate the combined sensorimotor, cognitive, and exertional demands of Soldiering for use after concussion/mild traumatic brain injury (mTBI). Task evaluation criteria including inter-rater reliability and total test time findings are being used to refine the task battery. Using healthy control subjects, dual-tasks have shown excellent inter-rater reliability; while ongoing refinement of task instructions and scoring has improved multitask reliability. All regulatory approvals have been obtained and data collection in both healthy control and SM with mTBI has begun at Fort Bragg/Womack Army Medical Center in order to determine preliminary construct and discriminate validity of the AMMP. Investigators anticipate that once validated, the AMMP will discriminate between duty-ready and non-duty ready military Service members (SM) following mTBI and will be used in combination with other metrics to inform duty-readiness decisions.